Krzywoszanski/a or Krzywoszynski/a are not all that plentiful names in Poland; some families in Tarnopolskie ( as you suggested) and perhaps in Lwowskie were arrested in 1939/40.
Krzywoszanski Jozef son Jakuba b 1907 was sent to Katyn.
Krzwoszynski Jozef b 1907 sent to Katyn.
Jakub syn Marcina b 1888; Marian syn Michala b 1915 were jailed at Lwow nr 1 jail and one would have to contact Karta for details.
As regards Mieczyslaw or Stanislawa I cannot see any reference in the Russian lists at all. It is difficult to say how the Russians would have spelt this name. Direct transliteration or a judicial guess does not lead to any details so far. I am sorry.
We'll keep looking.
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